Crisis response is generally acknowledged as a crucial aspect of crisis management. Crisis response often requires a need to improvise because the circumstances demand spontaneous innovation that departs from established procedures. Although previous research has acknowledged improvisation as a valuable component of crisis response, it has not provided adequate conceptual understanding of improvisation. Moreover, studies on the role played by information technology (IT) in crisis are inconsistent regarding the ways that IT may support improvised responses. As a result, few recommendations could be formulated to guide practitioners in using IT to respond to crises, thereby wasting crucial resources. This paper proposes a definition of improv...